The purpose of this study was to examine the longitudinal, bidirectional relationship between language skills and behavior problems in a sample of 194 preschool children enrolled in Head Start programs. Children were individually assessed using the Preschool Language Scale-5, and teachers completed the Child Behavior Checklist-Teacher Report 1½–5. Cross-lagged path models using a structural equation modeling approach tested the reciprocal associations between language skills and behavior problems over the preschool year. Findings supported a bidirectional relationship between internalizing behavior problems and expressive language skills. However, findings supported a unidirectional association between early receptive language skills and later internalizing behavior problems. Gender moderated the relationship between receptive and expressive language skills and internalizing behavior problems in such a way that the association was only significant for girls. Implications for early intervention and prevention efforts targeting language development and behavior problems were discussed.

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Guided by an ecological model, we tested whether teacher–child interaction quality buffered the negative associations between challenging behavior within preschool classroom contexts and language and literacy skills. Associations were examined for a sample of children enrolled an urban Head Start program ( N = 304 children across 53 classrooms). Findings from multilevel models supported direct associations between challenging behaviors within preschool learning contexts and language outcomes. Higher instructional support was associated with higher language and literacy outcomes for all children within classrooms regardless of behavioral risk. Higher classroom organization was directly associated with higher classroom literacy skills. Emotional support moderated associations between challenging behaviors in teacher contexts and literacy outcomes. Implications for future research, policy, and practice are discussed.